ELISA and Chemiluminescent Enzyme Immunoassay for Sensitive and Specific Determination of Lead (II) in Water, Food and Feed Samples

• Published in: Foods Vol. 9; no. 3; p. 305
• Main Authors: Xu, Long, Suo, Xiao-Yi, Zhang, Qi, Li, Xin-Ping, Chen, Chen, Zhang, Xiao-Ying
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 08.03.2020; MDPI
• Subjects: Chemiluminescence; chemiluminescent enzyme immunoassay (cleia); Competition; elisa; Enzyme immunoassay; Enzyme-linked immunosorbent assay; Food chains; Food contamination & poisoning; Food science; Heavy metals; Immunoassay; Immunoassays; isothiocyanobenzyl-edta (itcbe); lead (ii); Lead content; Metal ions; monoclonal antibody (mab); Public health; Sensitivity; Sensors; United States > US; China; isothiocyanobenzyl-EDTA (ITCBE); lead (II); chemiluminescent enzyme immunoassay (CLEIA); monoclonal antibody (mAb); ELISA
• ISSN: 2304-8158; 2304-8158
• DOI: 10.3390/foods9030305

Lead is a heavy metal with increasing public health concerns on its accumulation in the food chain and environment. Immunoassays for the quantitative measurement of environmental heavy metals offer numerous advantages over other traditional methods. ELISA and chemiluminescent enzyme immunoassay (CLEIA), based on the mAb we generated, were developed for the detection of lead (II). In total, 50% inhibitory concentrations (IC ) of lead (II) were 9.4 ng/mL (ELISA) and 1.4 ng/mL (CLEIA); the limits of detection (LOD) were 0.7 ng/mL (ic-ELISA) and 0.1 ng/mL (ic-CLEIA), respectively. Cross-reactivities of the mAb toward other metal ions were less than 0.943%, indicating that the obtained mAb has high sensitivity and specificity. The recovery rates were 82.1%-108.3% (ic-ELISA) and 80.1%-98.8% (ic-CLEIA), respectively. The developed methods are feasible for the determination of trace lead (II) in various samples with high sensitivity, specificity, fastness, simplicity and accuracy.